The pros and cons of choosing a single vendor for a firm's SAN infrastructure comes down to flexibility vs. lock-in.
There is no right or wrong in either. It depends on the firms strategies and on the relationship and trust build up between the vendor and the company.
Here's a short list of pros and cons:
This list is certainly not complete, but it shows some of the major pros and cons when it comes down to the question of whether to choose a single vendor for SAN. Personally I would prefer a single vendor if that vendor could provide a working solution that delivers all needed requirements including the requirements of an acceptable ROI on the infrastructure. This is basically because I believe that a smooth operating environment is worth more than the flexibility. But it has to be clear that the vendor can provide such a smooth operating environment in the long run.
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This was first published in October 2003